Max Planck Institute for Gravitational Physics (Albert Einstein Institute)
LISA Data Analysis Preparation: Tilt-to-length Noise Subtraction
The coupling of an angular jitter into the interferometric phase readout is expected to be a major noise source in the inter-satellite interferometry for the LISA space mission
Subtraction of TTL noise from TDI X (black), expressed in terms of the square root of the PSD. The TTL in TDI X contribution is shown in red. If we subtract TTL using the true (simulated) values for all the coupling coefficients, we obtain the cyan curve. If we use our estimated values and do the subtraction, we get the blue crosses. Note that the crosses are just markers and do not represent uncertainties. The difference between the two ways of subtracting (cyan and blue) is shown in green. We compare to the requirement in dashed grey.
Subtraction of TTL noise from TDI X (black), expressed in terms of the square root of the PSD. The TTL in TDI X contribution is shown in red. If we subtract TTL using the true (simulated) values for all the coupling coefficients, we obtain the cyan curve. If we use our estimated values and do the subtraction, we get the blue crosses. Note that the crosses are just markers and do not represent uncertainties. The difference between the two ways of subtracting (cyan and blue) is shown in green. We compare to the requirement in dashed grey.
The coupling of an angular jitter into the interferometric phase readout is summarized under the term tilt-to-length (TTL) coupling. This noise is expected to be a major noise source in the inter-satellite interferometry for the LISA space mission (see red line in the Figure).
We develop and test a procedure to remove TTL noise in post-processing on Earth, without reducing the measurement time of the observatory. To support this, we developed two LISA simulators. One of these simulators, LISASim, has been used to generate the results shown in the Figure. Indeed, the noise after subtraction of TTL with our procedure (blue crosses) is below the required noise level (dashed grey trace). For more details, we refer to Phys. Rev. D 106, 042005.
This project is a close collaboration between the AEI, the UK Astronomy Technology Centre, Royal Observatory in Edinburgh and the Aristotle University of Thessaloniki as well as other partners in the LISA Consortium.
Literature
1.
Paczkowski, S.; Giusteri, R.; Hewitson, M.; Karnesis , N.; Fitzsimons , E. .; Wanner, G.; Heinzel, G.: Postprocessing subtraction of tilt-To-length noise in LISA. Physical Review D 106 (4), 042005 (2022)
Wanner, G.; Karnesis, N.; LISA Pathfinder collaboration: Preliminary results on the suppression of sensing cross-talk in LISA Pathfinder. 11th International LISA Symposium, Zurich, Switzerland, September 05, 2016 - September 09, 2016. Journal of Physics: Conference Series 840, 012043, (2017)
The November of Science at the Max Planck Institute for Gravitational Physics (Albert Einstein Institute) and the Institute for Gravitational Physics of Leibniz Universität Hannover with seven exciting events
The gravitational-wave and experimental astrophysicist will establish a third department at the Max Planck Institute for Gravitational Physics in Hannover
